#NOT READY FOR USE!!
In Development
A Node-RED node to query PostgreSQL, with multiple query support.
Original Project From node-red-contrib-postgres-multi by BruceFletcher
This module is designed assuming you will only use this one or Kris' original version in a project, but not both at the same time. You can replace one with the other in your project and your flows will remain connected.
- The configuration code is identical, so your database connection configuration should need no changes.
- The output format is identical (assuming equivalent queries)
- The input format is significantly different, and will require updates on any block generating queries to be passed to Postgres. (The queries shouldn't change, just the encapsulating data structure.)
This module uses JavaScript features only found in Node versions 12+.
Run the following command in the root directory of your Node-RED install
npm install node-red-contrib-postgres-multi
Assemble your queries as an array of objects on msg.payload:
msg.payload = [
{
query: 'insert into mytable (id, message) values (1, $hello), (2, $world)',
params: {
hello: 'Hi there',
world: 'O\'Rorke',
},
}
];
As you can see, this structure allows you to create your own transaction boundaries.
If you want the output of one or more queries, check the 'Receive output' box in the postgres node
and include an output: true member in the query object(s) you expect results from.
The results are then set on the msg.payload property of the outbound message.
msg.payload = [
{
query: 'select message from mytable where id=$1',
params: [1],
output: true,
},
{
query: 'select message from mytable where id=$1',
params: [2],
output: true,
},
];
# output:
[
['Hi there'],
['O\'Rorke']
]